2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
28 * Standard C library function wrappers.
30 * This file provides wrappers for all the standard C library functions
31 * like malloc(), free(), printf(), getenv(), etc.
48 /**********************************************************************/
52 /** Allocate a structure of type \p T */
53 #define MALLOC_STRUCT(T) (struct T *) malloc(sizeof(struct T))
54 /** Allocate and zero a structure of type \p T */
55 #define CALLOC_STRUCT(T) (struct T *) calloc(1, sizeof(struct T))
61 * For GL_ARB_vertex_buffer_object we need to treat vertex array pointers
62 * as offsets into buffer stores. Since the vertex array pointer and
63 * buffer store pointer are both pointers and we need to add them, we use
65 * Both pointers/offsets are expressed in bytes.
67 #define ADD_POINTERS(A, B) ( (GLubyte *) (A) + (uintptr_t) (B) )
71 * Sometimes we treat GLfloats as GLints. On x86 systems, moving a float
72 * as a int (thereby using integer registers instead of FP registers) is
73 * a performance win. Typically, this can be done with ordinary casts.
74 * But with gcc's -fstrict-aliasing flag (which defaults to on in gcc 3.0)
75 * these casts generate warnings.
76 * The following union typedef is used to solve that.
78 typedef union { GLfloat f
; GLint i
; GLuint u
; } fi_type
;
82 /**********************************************************************
86 /* Degrees to radians conversion: */
87 #define DEG2RAD (M_PI/180.0)
91 #if _MSC_VER < 1800 /* Not req'd on VS2013 and above */
92 #define strtoll(p, e, b) _strtoi64(p, e, b)
93 #endif /* _MSC_VER < 1800 */
94 #define strcasecmp(s1, s2) _stricmp(s1, s2)
100 *** LOG2: Log base 2 of float
102 static inline GLfloat
LOG2(GLfloat x
)
105 /* This is pretty fast, but not accurate enough (only 2 fractional bits).
106 * Based on code from http://www.stereopsis.com/log2.html
108 const GLfloat y
= x
* x
* x
* x
;
109 const GLuint ix
= *((GLuint
*) &y
);
110 const GLuint exp
= (ix
>> 23) & 0xFF;
111 const GLint log2
= ((GLint
) exp
) - 127;
112 return (GLfloat
) log2
* (1.0 / 4.0); /* 4, because of x^4 above */
114 /* Pretty fast, and accurate.
115 * Based on code from http://www.flipcode.com/totd/
120 log_2
= ((num
.i
>> 23) & 255) - 128;
121 num
.i
&= ~(255 << 23);
123 num
.f
= ((-1.0f
/3) * num
.f
+ 2) * num
.f
- 2.0f
/3;
124 return num
.f
+ log_2
;
130 *** IS_INF_OR_NAN: test if float is infinite or NaN
132 #if defined(isfinite)
133 #define IS_INF_OR_NAN(x) (!isfinite(x))
134 #elif defined(finite)
135 #define IS_INF_OR_NAN(x) (!finite(x))
136 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
137 #define IS_INF_OR_NAN(x) (!isfinite(x))
139 #define IS_INF_OR_NAN(x) (!finite(x))
144 * Convert float to int by rounding to nearest integer, away from zero.
146 static inline int IROUND(float f
)
148 return (int) ((f
>= 0.0F
) ? (f
+ 0.5F
) : (f
- 0.5F
));
153 * Convert float to int64 by rounding to nearest integer.
155 static inline GLint64
IROUND64(float f
)
157 return (GLint64
) ((f
>= 0.0F
) ? (f
+ 0.5F
) : (f
- 0.5F
));
162 * Convert positive float to int by rounding to nearest integer.
164 static inline int IROUND_POS(float f
)
167 return (int) (f
+ 0.5F
);
171 # include <xmmintrin.h>
175 * Convert float to int using a fast method. The rounding mode may vary.
177 static inline int F_TO_I(float f
)
179 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
181 __asm__ ("fistpl %0" : "=m" (r
) : "t" (f
) : "st");
183 #elif defined(USE_X86_ASM) && defined(_MSC_VER)
190 #elif defined(__x86_64__)
191 return _mm_cvt_ss2si(_mm_load_ss(&f
));
198 /** Return (as an integer) floor of float */
199 static inline int IFLOOR(float f
)
201 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
203 * IEEE floor for computers that round to nearest or even.
204 * 'f' must be between -4194304 and 4194303.
205 * This floor operation is done by "(iround(f + .5) + iround(f - .5)) >> 1",
206 * but uses some IEEE specific tricks for better speed.
207 * Contributed by Josh Vanderhoof
211 af
= (3 << 22) + 0.5 + (double)f
;
212 bf
= (3 << 22) + 0.5 - (double)f
;
213 /* GCC generates an extra fstp/fld without this. */
214 __asm__ ("fstps %0" : "=m" (ai
) : "t" (af
) : "st");
215 __asm__ ("fstps %0" : "=m" (bi
) : "t" (bf
) : "st");
216 return (ai
- bi
) >> 1;
221 af
= (3 << 22) + 0.5 + (double)f
;
222 bf
= (3 << 22) + 0.5 - (double)f
;
223 u
.f
= (float) af
; ai
= u
.i
;
224 u
.f
= (float) bf
; bi
= u
.i
;
225 return (ai
- bi
) >> 1;
230 /** Return (as an integer) ceiling of float */
231 static inline int ICEIL(float f
)
233 #if defined(USE_X86_ASM) && defined(__GNUC__) && defined(__i386__)
235 * IEEE ceil for computers that round to nearest or even.
236 * 'f' must be between -4194304 and 4194303.
237 * This ceil operation is done by "(iround(f + .5) + iround(f - .5) + 1) >> 1",
238 * but uses some IEEE specific tricks for better speed.
239 * Contributed by Josh Vanderhoof
243 af
= (3 << 22) + 0.5 + (double)f
;
244 bf
= (3 << 22) + 0.5 - (double)f
;
245 /* GCC generates an extra fstp/fld without this. */
246 __asm__ ("fstps %0" : "=m" (ai
) : "t" (af
) : "st");
247 __asm__ ("fstps %0" : "=m" (bi
) : "t" (bf
) : "st");
248 return (ai
- bi
+ 1) >> 1;
253 af
= (3 << 22) + 0.5 + (double)f
;
254 bf
= (3 << 22) + 0.5 - (double)f
;
255 u
.f
= (float) af
; ai
= u
.i
;
256 u
.f
= (float) bf
; bi
= u
.i
;
257 return (ai
- bi
+ 1) >> 1;
263 * Is x a power of two?
266 _mesa_is_pow_two(int x
)
268 return !(x
& (x
- 1));
272 * Round given integer to next higer power of two
273 * If X is zero result is undefined.
275 * Source for the fallback implementation is
276 * Sean Eron Anderson's webpage "Bit Twiddling Hacks"
277 * http://graphics.stanford.edu/~seander/bithacks.html
279 * When using builtin function have to do some work
280 * for case when passed values 1 to prevent hiting
281 * undefined result from __builtin_clz. Undefined
282 * results would be different depending on optimization
283 * level used for build.
285 static inline int32_t
286 _mesa_next_pow_two_32(uint32_t x
)
288 #ifdef HAVE___BUILTIN_CLZ
289 uint32_t y
= (x
!= 1);
290 return (1 + y
) << ((__builtin_clz(x
- y
) ^ 31) );
303 static inline int64_t
304 _mesa_next_pow_two_64(uint64_t x
)
306 #ifdef HAVE___BUILTIN_CLZLL
307 uint64_t y
= (x
!= 1);
308 STATIC_ASSERT(sizeof(x
) == sizeof(long long));
309 return (1 + y
) << ((__builtin_clzll(x
- y
) ^ 63));
325 * Returns the floor form of binary logarithm for a 32-bit integer.
328 _mesa_logbase2(GLuint n
)
330 #ifdef HAVE___BUILTIN_CLZ
331 return (31 - __builtin_clz(n
| 1));
334 if (n
>= 1<<16) { n
>>= 16; pos
+= 16; }
335 if (n
>= 1<< 8) { n
>>= 8; pos
+= 8; }
336 if (n
>= 1<< 4) { n
>>= 4; pos
+= 4; }
337 if (n
>= 1<< 2) { n
>>= 2; pos
+= 2; }
338 if (n
>= 1<< 1) { pos
+= 1; }
345 * Return 1 if this is a little endian machine, 0 if big endian.
347 static inline GLboolean
348 _mesa_little_endian(void)
350 const GLuint ui
= 1; /* intentionally not static */
351 return *((const GLubyte
*) &ui
);
356 /**********************************************************************
361 _mesa_align_malloc( size_t bytes
, unsigned long alignment
);
364 _mesa_align_calloc( size_t bytes
, unsigned long alignment
);
367 _mesa_align_free( void *ptr
);
370 _mesa_align_realloc(void *oldBuffer
, size_t oldSize
, size_t newSize
,
371 unsigned long alignment
);
374 _mesa_exec_malloc( GLuint size
);
377 _mesa_exec_free( void *addr
);
381 #define FFS_DEFINED 1
382 #ifdef HAVE___BUILTIN_FFS
383 #define ffs __builtin_ffs
385 extern int ffs(int i
);
388 #ifdef HAVE___BUILTIN_FFSLL
389 #define ffsll __builtin_ffsll
391 extern int ffsll(long long int i
);
393 #endif /* FFS_DEFINED */
396 #ifdef HAVE___BUILTIN_POPCOUNT
397 #define _mesa_bitcount(i) __builtin_popcount(i)
400 _mesa_bitcount(unsigned int n
);
403 #ifdef HAVE___BUILTIN_POPCOUNTLL
404 #define _mesa_bitcount_64(i) __builtin_popcountll(i)
407 _mesa_bitcount_64(uint64_t n
);
411 * Find the last (most significant) bit set in a word.
413 * Essentially ffs() in the reverse direction.
415 static inline unsigned int
416 _mesa_fls(unsigned int n
)
418 #ifdef HAVE___BUILTIN_CLZ
419 return n
== 0 ? 0 : 32 - __builtin_clz(n
);
434 _mesa_round_to_even(float val
);
437 _mesa_float_to_half(float f
);
440 _mesa_half_to_float(GLhalfARB h
);
443 _mesa_half_is_negative(GLhalfARB h
)
449 _mesa_strdup( const char *s
);
452 _mesa_str_checksum(const char *str
);
455 _mesa_snprintf( char *str
, size_t size
, const char *fmt
, ... ) PRINTFLIKE(3, 4);
458 _mesa_vsnprintf(char *str
, size_t size
, const char *fmt
, va_list arg
);
461 #if defined(_MSC_VER) && !defined(snprintf)
462 #define snprintf _snprintf
471 #endif /* IMPORTS_H */